4R70W Shifting Problems

'Microsquirt' Transmission Control development and support.

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pcf_mark
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Joined: Tue Feb 24, 2015 9:09 pm

Re: 4R70W Shifting Problems

Post by pcf_mark »

I was hoping to get this verified before I try re-wiring. I have a V3 Microsquirt (plastic case) board so I wired it to the instructions here:

http://www.megasquirt.co.uk/doc/pdf/Tra ... -10-27.pdf on page 20 and 21. The wiring for V1 and V2 (page 19 and 20) is definitely different (the changes look to be around the selector)

Thanks!
pcf_mark
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Re: 4R70W Shifting Problems

Post by pcf_mark »

I made the following wiring changes - combining V1/V2 wiring with V3.

Pin / MS function / DIYautotune color
Pin 25 / CLT / Yellow to position B (formerly not used V3)
Pin 26 / MAT / Orange to position A (formerly trans temp V3)
Pin 34 / O2 / Pink to position C (formerly not used V3)
Pin 24 / MAT / Green/Red to trans temp sensor (formerly not used V3)

Results:
Selector lever / TS reading for indicator
P 0
R 3
N 0
D 4
2 4
1 1

(I can only select 3 positions manually, 3rd is 4th with OD cancel function I think)

I have not taken a test drive yet (too much electrical tape from testing needs to be cleaned up) but this looks perfect except 2nd.

The trans temp gauge is reading 93 degrees but it is only about 40 in the garage so that may be a little wonky or need a calibration.

Thanks for staying with me as I sort this out.

Happy New Year!
jsmcortina
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Re: 4R70W Shifting Problems

Post by jsmcortina »

I'm confused here, did you intentionally use an obsolete manual?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

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pcf_mark
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Re: 4R70W Shifting Problems

Post by pcf_mark »

Not intentionally no. This was the first reference i found with both V1/2 and V3 together.

I used the V3 wiring in the pdf in the zip with the trans code when i wired initially and that is flawed. The beta code includes the same wiring table with 11, 12, 29 for selector and that does not work. V2 uses different pins and that seems to almost work with the exception of 2nd.

Edit..
I just took a test drive and things seem ok - shifts up an down 1through 4. Two odd items:

1) The trans temp gauge when selected in TS does not seem to be working.
2) The torque converter never seemed to lock up. Tough to see while driving but I took a lot also for reference.

I am going to tidy up my wiring a bit and double check everything.
jsmcortina
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Re: 4R70W Shifting Problems

Post by jsmcortina »

Can you confirm that your selector wiring is as per this post:
http://www.msextra.com/forums/viewtopic ... 24#p448011
at the end of the topic you posted that you were going to wire it a different way that won't work.
TR3A is NOT USED.

Why do you think the manual wiring is flawed?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
ashford
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Re: 4R70W Shifting Problems

Post by ashford »

jsmcortina wrote:Can you confirm that your selector wiring is as per this post:
[
Why do you think the manual wiring is flawed?

James
that is my idea, i lookead a schematics and the v1, 2, and 3 have the pins going to the same processor ports but have different wiring layouts. his testing showed that grounding pin 34 reacted like grounding sw c ( shows 1) and
grounding pin 25 acted like grounding sw b (shows 2),
that is how the v1 and 2 are wired in the manual but he sais he has a v3 micro squirt
jsmcortina
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Re: 4R70W Shifting Problems

Post by jsmcortina »

The code uses different processor pins for V3 vs.V1 and V2 Microsquirt. That's why the wiring is different.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
jsmcortina
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Re: 4R70W Shifting Problems

Post by jsmcortina »

pcf_mark wrote:V3 sorry I did not mention that.

Again - thanks for everyone's help.
Your tune is configured for a V1 or V2 Microsquirt. That is incorrect.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
pcf_mark
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Re: 4R70W Shifting Problems

Post by pcf_mark »

I'm sorry I do not know how to tell a V1/V2 or a V3 in the tune I'll start looking into it because I do not know how to adjust or change that. I assumed a brand new microsquirt V3 I installed V3 firmware then started a new project it would be a V3 tune. Once I get to a V3 tune then it would make sense for the original wiring I had to work using:

A = TR1
B = TR2
C = TR4

The confusion started with V2 behavior on my V3 wiring. Today when I wired it like a V2 it was almost right.

EDIT - I just found that in the drop down I'll start there and see what happens!

So much closer thanks!
pcf_mark
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Re: 4R70W Shifting Problems

Post by pcf_mark »

I just updated my tune to a microsquirt V3 and put the wiring back to the V3 manual and it shifting properly ( needs some tune work but I expected that). Torque converter lock up and trans temp are working!

Thanks for all your help this was really a challenge.

Now I can solder everything back up nice and neat and start learning how the padle shifters and od cancel are supposed to work!

Thanks again!
jsmcortina
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Re: 4R70W Shifting Problems

Post by jsmcortina »

Good to hear that. There is some extra information that could do with adding to the manual that I didn't know when I put the last revision out.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
pcf_mark
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Joined: Tue Feb 24, 2015 9:09 pm

Re: 4R70W Shifting Problems

Post by pcf_mark »

Thanks again!
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